Temperature difference evolution of the points with highest temperature on the x = 0 plane at the location of maximum gradient of Alfvén speed in each simulation: l = 0.75 (dotted line), l = 0.50 (continuous line), and l = 0.35 (dashed line). Note that the time axes have been shifted so that we plot the elapsed time from when the heating starts. At the end of each line, we report the z-coordinate of the point and the time at which the heating of the point starts.